Grav Labs Large Gravitron Glass Gravity Bong

Grav Labs brought sophistication to the basement-made gravity bong. Gone are the days of scissors and 2-liter bottles of Mountain Dew. The Gravitron bong is the first all-glass gravity system, so plastic pollutants can no longer infiltrate your smoke. 

The large Gravitron bong is 11 inches tall and approx. 4 inches in diameter. The outer base is designed to hold about 5.5  inches of water—the fill line sits right below the bottom of the GRAV decal. This represents Grav's second version of its iconic Gravity Bong, the main difference is that this piece is made with thicker glass and its 19mm female joint is designed to hold any 19mm male bowl.

To use the glass gravity bong, first pack the Grav 19mm funnel bowl with dry herb and then light it. After lighting, start to pull the inner bottle slowly upward, smoke from the bowl will fill the chamber. Once the bottom of the glass bottle is just below the water's surface, remove the bowl. You then use the 19mm joint as a mouthpiece. Lowering the bottle back into the chamber forces smoke up through the downstem in a pressurized flow as the user inhales from the mouthpiece. A rubber seal lines the base of the inside bottle, so the inner glass will not clink or scratch against the outer glass. This powerful gravity bong results in fast and massive hits. 

But don't be afraid to take a spin on the Gravitron Bong. It's a fun ride.

Only the Best from Grav Labs

The Gravitron Glass Gravity bong was designed by Grav Labs CEO, Dave Daily, in 2004 as originally the only product the company sold and was redesigned in 2021 to be more sturdy and more functional. The Austin-based brand remains a respected name in the scientific glass game. They design, manufacture, and distribute some of the most recognizable pieces on head shop shelves, most notably the Gravitron. The well-known design marks an important place in toker history, and the glass gravity bong is just as beloved today as it was then.

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